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Single crystals of the amino acid analogue hippuric acid, PhCONHCH 2 COOH, have been X-irradiated at 295 K and studied using X-band EPR, ENDOR, and ENDOR-induced EPR (EIE) spectroscopy at 295 and 130 K. Two different radical species were observed and characterized. The dominant species is radical R1, PhCONH-• CH 2 , supposedly formed by net decarboxylation from a pristine oxidation product. The nitrogen hyperfine and quadrupolar interactions yield information on the electronic structure in the nitrogen valence orbitals. The second radical species, radical R2, is formed by a net hydrogen addition to the phenyl entity of hippuric acid. As a reduction product, it may be formed by protonation of the negatively charged anion of the phenyl group, but the alternative mechanism of direct hydrogen addition to the phenyl ring cannot be ruled out. Spectral simulations indicate that radical R1 contributes about 85% of the total EPR spectrum, while the remaining 15% is contributed by radical R2.

Burning incense often produces air pollutants that may represent a health risk for humans. The Polycyclic Aromatic Hydrocarbons (PAHs) were identified in Oud incense which is matter of great concern because nowadays, incense is used inside homes as well as in public places and its adverse health effect cannot be ignored. Our main objective was to assess the concentration of individual PAHs compound in the smoke of Oud incence. The PAHs concentrations were determined by using High Performance Liquid Chromatography (HPLC). All Oud samples were collected from local market of Al-Baha city southwest Saudi Arabia. The total mean concentration of PAHs in Oud samples was 2.79 mg/m 3 and the mean concentration of individual PAHs namely naphthalene, acenaphthene, acenaphthylene, fluorene, phenanthrene, anthracene, fluoranthene, pyrene, chrysene, benzo(a)anthracene, benzo(b)fluoranthene and benzo(a) pyrene was 0

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